Film-winding machine



D. ISNOW,

FILM WINDING MACHINE.

' APPLICATION FILED JUNE 10, 1918. RENEWED NOV. 29. 1920.

1,382,288. Patented June 21, 1921.

3 SHEETS-SHEET I.

D. ISNOW.

FILM WINDING MACHINE.

APPLICATION FILED JUNE 10, I918- RENEWED NOV. 29. 1920.

1,382,288. Patented June 21; 1921.

3 SHEETS-SHEET 2.

fla /8k;-

D ISNOW.

FILM WINDING MACHINE.

APPLICATION FILED JUNE 10, 191B- RENEWED NOV. 29. 1920.

1,382,288. Patented June 21, 1921.

i 3 SHEETS-SHEET 3- UNITED STATES PATENT as...

DEMETRY ISN'OW, OF LOS ANGELES, CALIFORNIA, ASSIGNUB TO MIG 015 LOS ANGELES, C -.%.LIFORNIA.

HAEL LESHING,

Specification of Letters Patent.

Patented June 21, 1921.

Application filed June 10, 1918, Serial No. 239,319. Renewed November 29, 1920. Serial No. 427,209.

To all whom it may concern Be it known that I, DE-METRY lsnow, a citizen of Russia, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Film-Winding Machine, of which the following is a specification.

My invention relates to the motion picture art and more particularly to the art of developing and washing films. It is common practice in laboratories in which film is developed to wind the film on racks which are then placed in tanks in which they are developed and fixed.

My invention comprises means {or winding the film evenly and at uniform tension on such racks. The principal object of my invention is to provide a. machine by which a roll of film may be wound on a rack without the necessity of touching the film during the winding, and in such a manner that the film will be evenly distributed at a uniform tension across the rack.

Further objects and advantages will be made evident hereinafter.

Referring to the drawings which are for illustrative purposes only.

Figure 1 is an end elevation of one embodiment of my invention.

Fig. 2 is a side elevation with the rack and supporting parts omitted.

Fig. 3 is an end view on an enlarged scale of the winding head.

Fig. 4 is a. side view of the same.

Fig. 5 is a section on a plane represented by the line 5-5 ofFig. 3. this plane being viewed in the direction of the arrows.

Fig. 6 is a side elevation on a still further enlarged scale of a portion of the mechanism.

Fig. 7 is a view of a portion of themechanism shown in Fig. 3 shown in a different position.

Fig. 8 shows method of securing inside end of film.

In the form of my invention illustrated in these drawings, a base 11 is provided to which are secured rack supports 12;, and head supports 13, these rack and head supports being braced to the base 11 by members 14 for the purpose of making them rigid. Detachably mounted on a shaft 20 between the rack supports 12 is a rack 21, this rack being driven by pulley 22 through a belt 23 which passes over idlers 24 to a similar pulley 25 rigidly secured to a gear 26 which may be turned by a handle 27. The gear 26 also drives a pinion which is ri -idly secured to a head shaft 28, this'hea d Shaft hemg free to turn in bearings mounted in the head supports 13.

fiiecured to the head supports are head guides 30 and 31, these guides being provided with V shaped grooves in which a head 32 slides. he head 32 consists of a top frame guide 40 and a bottom "frame guide 41 in which is rigidly secured a frame follower 42. A pin 43 is secured in the follower 42 and a compression spring 44 surrounds the pin 43 and presses against the follower 42 and against a spring slide block 45 which is free to slide inside the guides 40 and 41 which are grooved as shown at 46 in Fig. 3.

Secured to the spring slide block 45 is a fixed cam 47 through which the pin43 passes, and co-acting with the fixed cam 47 and turning about the pin 43 is a movable cam 48 which is providedwith an arm 49 connected through a pivoted linlr 50 with a 3 pair of arms 51. Also sliding between the guides 40 and 41 is a cam slide 52 through which the pin 43 passes. this cam slide having a friction brake 53 -formed thereon. This friction brake engages a cone on a film carrier 54 which is free to slide and turn on the pin 43 and which is held in engagement with friction brake 58 by means of a locking block 55 which is hinged at 56 to a block 57 which in turn is rigidly secured to the guide 40. The end of the film is secured in a slot in the film carrier 54, as shown in Fig. 8. The locking block 55 is also secured, by means of a catch 60, to a block 61 secured to the guide 41. The screw 28 passes through an opening in the guide 41 and is engaged by a nut 70, which is secured on arm 71, hinged at 72 on a block 73 secured to the guide 41. i

The two arms 51 are located on either side of the cam slide 52 and are each pivoted on a pin 80 which passes through the cam slide 52. A pin 81 serves to connect the link 50 to the arms 51 and extends over as shown at 54 and carries a roller 82 which is of a proper size and shape to press against a' roll of film 9O placed on the film carrier 54:. This roller 82 is pressed against the roll of film 90 by means of a tension spring 85.

The method of operation of my invention is as follows:

The rack 21 being mounted as shown in Fig. l, and the end 91 of the film 90 being secured to the rack, the handle 27 is rotated in such a manner as to move the film rack in the direction of the arrow 92, the head 32 having been placed in such position that the film 90 is led directly to one side of the rack 21. .Further rotationof the handle 27 swingsthe rack 23'. and winds the film thereon. During this winding the screw 28 moves the head 82 in the direction of thearrow 93 of 2, so that the film 90 is wound spirally on the rack. The friction brake 53 being forced over'by the spring ad tends to put a tension on the film 90, so that it is uniformly wound on the rack. 21. 'As the film is wound off theroll the diameter of the roll get-s smaller, and if the friction on the friction brake 53 were constant, the tension on the film would increase as the diameter of the roll decreases. It is, therefore, necessary to diminish the friction as the diameter ofthe roll of filn 90 decreases, so that the tension on the film will remain constant. It is for this purpose that the cams 47 and 48 are provided. These cams have inclined surfaces, as shown in Fig.6, so

7 formed that as the cam a8'is rotated with and 5a in proportion to thedecrease in diamrelation to the cam 47, the distance between the block so and the cam slide 52 is varied.v This movement of the cam 41-8 is controlled by the movement of the/roller 82, the. parts. moving from the position shown in Fig. 3 to. the position shown in Fig. 7, as the diameterof the roll decreases. The parts are so proportioned thatthe distance between the members 45 and 52 is decreasedas thediameter of the roll decreases, and the-spring n is so constructed. that this decrease relieves sufficient tension on the spring n to decrease the friction between the members 53 eterof the roll 90. g i I claim as my invention:

1. A frictionidevice for maintaining-a uniform tension on a relief material as it is unwound and therefore decreases in diametcr comprising a carrier upon which the roll or material-is carried; said carrier having a which said carrier turns; a cam slide having through which saidpin passes fixed to said guides; a'i xed cam secured to said spring slide bloclrabout said pin; aimovable cam free to: turn said pin, said movable cam coacting withsaid fixed cam to force said cam slide into engagement with said carrier; a

radial arm secured to said movable cam and by which said movable cam may be turned;

'a pivot fixed with relation to said guides;

and a spring so placed as to hold'said roller in contact withsaid material. f

2. A friction device for maintaining a uniform tension on a roll of material as it is unwound and therefore decreases in diameter comprising a carrier upon. which the roll of material is carried, a pin on which said carrier turns; a cam slide free to move along said pin and thus exert frictional pressure on the end of said carrier; guides in which said cam slide is free to move along said pin; a spring slide block through which said pin passes fixed to said guides; a fixed cam securedto said spring slide block about said pin; a movable cam free to turn on'said pin,

saidmovable cam coacting with said fixed cam to force said cam slide into engagement with said carrier; a radial arm secured to said movable cam and by which Sflld DIlOV".

able cammay be turned; alink'pivotedat one end on said'ar-m and at the other end on aroller pin; a roller turnin on said pin and sosituated as to bear on tie outersun face of said rollof materialgtwo members pivoted atone end on said roller pin. and

at the other end on a pivot fixedwith relation to saidguides; and a spring so placed V as to hold said roller in contactwithsaid.

material.

3. A friction unwound and therefore decreases in diam- 7 device for maintaining a uni- 1 form tenslon on a roll of material, asit is eter comprising a carrier upon which the roll of material is carried; said'carrier having a cone formed on one end thereof a pin i free to move ialongsaid pin; a spring slide block through which said pin passes fixed to said guides; a fixed cam secured'to said spring slide blockabout' said pin; a movable cam free to turn on said pm; said movable cam coacting withsaidfi'xed cam to force said cam slide into engagement with said carrier; a roller; means'by which the roller moves said-:movablecam; and a spring so placed as to hold said roller in contact with said i'n'aterial i. A friction device for maintaining a uniform tension on a roll of material as'it is unwound and therefore decreases in diameter comprising a carrier upon which the i i roll of material-is carried, apinon which said carrier turns; a cam slide free to'move along said pin and thus exert frictionalpressure on the end of said carrier; guides in which said cam slide is free to move along said pin; a spring slide block through which said pin passes fixed to said guides; at fixed cam secured tosaid spring slide block about said pin; a movable cam free to turn on said pin, said movable cam coacting with said fixed cam to force said cam slide into engagement with said carrier; a roller; means by which the roller moves said movable cam; and a spring so placed as to hold said roller in contact with said material.

5. A friction device for maintaining a uni ing a cone formed on one end thereof; a pin on which said carrier turns; a cam slide havinga conical depression into which said cone fits; guides in which said cam slide is free to move along said pin; a spring slide block through which said pin passes; fixed to said guides; cam means for forcing said spring slide block against said carrier; a

roller contacting with the outer surface of said material; means by Which the roller actuates said cam means, and a spring so placed as to hold said roller in contact with said material.

In testimony whereof, I have hereunto set my hand at 0s Angeles, California, this 31st day of May, 1918.

a DEMETRY ISNOWV. 

